TWI706178B - Composite multi-fiber multi-wavelength large-capacity optical transmission module - Google Patents

Abstract

A composite multi-fiber multi-wavelength large-capacity optical transmission module, including m groups of optical signal generators, a demultiplexer, n single-mode fibers, and n demultiplexers, each optical signal is produced The signal light of m different wavelengths is generated individually by the demultiplexer, and the incoming m×n signal light is adjusted by the demultiplexer into n channels of signal output light containing m kinds of wavelengths from different optical signal generators, and then n channels The single-mode optical fiber is transmitted to n demultiplexers, and each demultiplexer separates the signal light including m channels of different wavelengths. The present invention provides a new type of optical transmission module that can transmit signals from different The multiple signal lights output by the optical signal generator are individually combined into a single optical fiber for transmission, and then multiple signal lights are decoded, which effectively improves the overall optical transmission method and signal volume.

Description

Composite multi-fiber multi-wavelength large-capacity optical transmission module

The present invention relates to an optical system, in particular to an optical transmission module that includes a light guide and a coupler and can transmit signals of multiple wavelengths.

Referring to Figure 1, the optical communication technology that uses optical signals as transmission signals is the mainstream technology in the current communication market. At present, the optical communication wavelength division multiplexer system 1 (Wavelength Division Multiplexer, WDM) used to transmit multiple signals includes a light source generation 11, an optical multiplexer 12 connected to the light source generator 11, a single-mode optical fiber 13, and a de-multiplexer 14, both ends of the single-mode optical fiber 13 are respectively connected to the optical multiplexer 12 and The solution optical multiplexer 14.

The light source generator 11 includes a light generating element 111 for generating a basic light having a predetermined wavelength, and a light modulation unit 112 optically connected to the light generating element 111, and the light modulation unit 112 modulates the basic light component. n channels of signal light each having a predetermined wavelength λ _n carry and output signals with lights of different wavelengths λ _n ; the optical multiplexer 12 couples n channels of signal light individually having a predetermined wavelength λ _n into a single line including multiple wavelengths λ ₁ , Λ ₂ , ..., λ _n signal output light; the optical multiplexer 12 couples n channels of signal light with a predetermined wavelength λ _n into a single line including multiple wavelengths λ ₁ , λ ₂ , ..., λ _n After the signal output light is transmitted through the single-mode optical fiber 13, the demultiplexer 14 restores the signal output light according to the wavelength into a restored signal corresponding to the original n channels of individual signal light having a predetermined wavelength λ _n The light λn', finally, the output signal is obtained from the wavelengths λ1', λ2',..., λn-1', λn' of the restored signal light.

The aforementioned optical communication demultiplexer system 1 can indeed use the optical multiplexer 12 and the de-optical multiplexer 14 to simultaneously transmit multiple signals through a single single-mode optical fiber 13, but because its design principle lies in "One-to-one", that is, a light source generator 11 generates n channels of signal light with a predetermined wavelength λ _n , and then through the work of the optical multiplexer 12 and the de-light multiplexer 14 to be mounted separately The signals at the wavelengths λ ₁ , λ ₂ , ..., λ _n output light output signals. Therefore, when signals are to be transmitted from different light source generators 11, it is only possible to use multiple optical fibers to generate light from another light source. The signal generated by the device 11 tries to be imported into the original demultiplexer 14 to restore it to obtain the signal to be transmitted. As a result, the entire system will be more complicated and the construction cost will be greatly increased. In addition, the current optical communication demultiplexing system 1 also suffers from the fact that when the number of light source generators 11 is large, it is impossible to couple the signal light of a specified wavelength generated by individual light source generators 11 with a single optical multiplexer 12 and then Single optical fiber transmission, the solution optical multiplexer 14 restores the trouble of output signal.

Therefore, how to design a new type of optical transmission module to solve the problem of the "one-to-one" design principle is one of the research focuses in this field.

Therefore, the object of the present invention is to provide a composite multi-fiber multi-wavelength large-capacity optical transmission module for transmitting different optical signals generated from multiple generating ends to a predetermined receiving end and then restoring the signals to be transmitted. , In order to improve the existing optical transmission system erection problems and optical transmission capacity.

Therefore, a composite multi-fiber multi-wavelength large-capacity optical transmission module of the present invention includes m groups of optical signal generators, a split-wave multiplexer, n single-mode fibers, and n de-multiplexers.

Each group of optical signal generators individually includes a light generating element for generating a basic light with a predetermined wavelength, and a light modulation unit optically connected to the light generating element, and the light modulation unit divides the basic light into n signals. After the light is output, m and n are integers not less than 2.

The demultiplexer is optically connected to the m groups of optical signal generators, and includes m×n input terminals, n output terminals, and a demultiplexer unit optically connecting the input terminals and output terminals. The m×n The input terminal corresponds to the input of n channels of signal light from each group of optical signal generators. The demultiplexing unit adjusts one of the signal lights of each optical modulation unit into a signal output light containing signal lights of m wavelengths. Then output from one of the output terminals.

One end of each single-mode optical fiber is optically connected to one of the n output ends.

Each demultiplexer is optically connected to the other end of one of the n single-mode fibers for receiving the signal output light transmitted by the single-mode fiber optically connected, and then decomposes the signal output light into m channels Signal lights corresponding to the m types of basic lights, respectively.

The effect of the present invention is to provide a brand new optical transmission module, which mainly distributes n channels of signal light from one of the basic lights to the n output terminals through the demultiplexing unit, so that each The output end receives m channels of signal light from different optical signal generators, and then restores m different wavelength signals of the signal output light through the demultiplexer to improve the complexity of the system architecture and At the same time, the capacity of the optical transmission module is increased.

Referring to FIG. 2, an embodiment of the composite multi-fiber multi-wavelength large-capacity optical transmission module of the present invention includes m groups of optical signal generators 2, a demultiplexer 3, n single-mode fibers 4, and n Demultiplexer 5, where m and n are integers not less than 2 respectively.

Each optical signal generator 2 includes a light generating element 21 and a light modulating unit 22 connected to the light generating element 21. The light generating element 21 is used to generate basic light of a specific wavelength, and any light generating element 21 generates The basic light is different from the basic light generated by other light generating elements 21. The light modulation unit 22 has a light splitting element 221 and a light modulation element 222. The splitting element 221 divides the basic light generated by the light generating element 21 into For n channels of signal light, the light modulating element 222 performs signal modulation on the n channels of signal light. For the sake of clarity, the m groups of optical signal generators 2 are named as the first optical signal generator, the second optical signal generator,..., the m-1th optical signal generator, and the mth optical signal generator. To make a distinction; the basic light generated by the light generating elements 21 of the light signal generators 2 are respectively the first basic light λ ₁ , the second basic light λ ₂ , ..., the m-1th basic light λ _m-1 , The m-th basic light λ _m represents; the signal lights after the basic lights are modulated by the light modulation element are expressed in the form of wavelength λ _mn . For example, the light modulation unit 22 of the first optical signal generator converts the first light A basic light λ1 is divided into n channels of signal light with wavelengths λ ₁₁ , λ ₁₂ , ..., λ _1(n-1) , λ _1n , and the _m- th basic light λ _{m is} divided into n channels with wavelengths λ _m1 , λ _m2 , …, λ _{m (n-1)} , λ _mn signal light, and the wavelength of the signal light divided from the basic light is not necessarily equal to the wavelength of the original basic light, such as the first basic light λ ₁ The wavelengths λ ₁₁ , λ ₁₂ , ..., λ _1n of the signal light do not necessarily have to be equal to λ ₁ .

The demultiplexer 3 includes m×n input terminals 31, n output terminals 33, and a demultiplexing unit 32 optically connecting the input terminals 31 and the output terminals 33. The m×n input terminals 31 is connected to the light modulation element 222 of the m groups of optical signal generators 2 for transmitting the m×n signal lights λ ₁₁ , λ ₁₂ , ..., which are split and modulated by each of the split light modulation units 22 λ _{m (n-1)} and λ _mn enter the demultiplexing unit 32.

，其中，

為自由光譜範圍， c為光速，

為光程差。 In this embodiment, the demultiplexing unit 32 has two slab waveguides and a set of channel waveguides optically connected between the two slab waveguides. Not shown in the figure. The two slab waveguides are geometrically symmetrical to each other. When λ ₁₁ , λ ₁₂ ,..., λ _{m (n-1)} , λ _{mn respectively} enter one of the slab waveguides through the m×n input terminal 31, they will be dispersed uniformly and in phase according to the principle of dispersion and enter In the channel waveguides, a predetermined optical path difference is generated between the n channels of signal light divided by the same basic light during the travel of different channel waveguides, where the optical path difference satisfies

,among them,

Is the free spectral range, c is the speed of light,

Is the optical path difference.

，

為訊號光的自由光譜範圍，

為輸出端33的數量，

為該輸出端33之間的距離，因此，由該第一基礎光λ ₁透過該第一信號生產器的光調制單元22所分成的該n道λ ₁₁、λ ₁₂、……、λ _1n訊號光各自分配至其中一輸出端33。類似地，其他基礎光所分出的n道訊號光各自對應匯聚其中一道至每一輸出端33中，例如第m基礎光所分成的n道訊號光λ _m1、λ _m2、……、λ _{m (n-1)}、λ _mn透過該分波多工單元32而進入其中一輸出端33，因此，在每一輸出端33匯聚m道訊號光，且該m道訊號光分別來自每一個光信號產生器2所分出的其中一道訊號光。 Taking the n channels of signal light λ ₁₁ , λ ₁₂ , ..., λ _1n split from the first basic light λ ₁ as an example, the n channels of signal light λ ₁₁ , λ ₁₂ , ..., λ _1n are input from n of them After the end 31 enters the slab waveguide, it generates an optical path difference between each other through the channel waveguide, and then the n channels of signal light with the optical path difference enters another slab waveguide, and interferes based on the multi-slit principle of waves, causing the The signal lights λ ₁₁ , λ ₁₂ ,..., λ _1n each get the largest constructive interference at the positions of the n output terminals 33, that is, the n signal lights λ ₁₁ , λ ₁₂ ,..., λ _1n respectively corresponding to converge the n outputs 33, 33 enter the end of each output wherein a first light signal from a base of the divided light λ _1; wherein each of the n-channel signal light converge the output terminal 33 Process satisfaction

,

Is the free spectral range of signal light,

Is the number of output terminals 33,

Is the distance between the output ends 33, therefore, the n channels λ ₁₁ , λ ₁₂ , ..., λ _1n signals divided by the first basic light λ ₁ through the light modulation unit 22 of the first signal generator The light is distributed to one of the output terminals 33 respectively. Similarly, the n channels of signal light separated by other basic lights are respectively converged into one of them to each output end 33, for example, n channels of signal light λ _m1 , λ _m2 , ..., λ _m divided by the m-th basic light _(n-1) λ _mn passes through the demultiplexer unit 32 and enters one of the output terminals 33. Therefore, m channels of signal light are gathered at each output terminal 33, and the m channels of signal light come from each optical signal generator. One of the signal lights separated by the device 2.

Each of the output terminals 33 forms a signal output light from the m channels of signal light, and the n channels of signal output light are respectively the first signal output light, the second signal output light,..., the n-1th signal output light, The n-th signal output light means, for example, the first signal output light is composed of m channels of signal lights λ ₁₁ , λ ₂₁ , ..., λ _(m-1)1 , λ _m1 from different optical signal generators 2 respectively , The n-th signal output light is composed of m channels of signal light λ _1n , λ _2n , ..., λ _(m-1)n , λ _mn generated by different optical signal generators 2.

One end of each single-mode optical fiber 4 is connected to one of the output ends 33 for transmitting the signal output light with m wavelengths of signal light to the one of the demultiplexers 5, and then the demultiplexer 5 will The signal output photodecomposes m channels of decomposed signal light; that is, when the signal output light composed of m different wavelengths and signal lights generated by different optical signal generators 2 passes through the demultiplexer 5, Due to the optical path difference between the signal lights of different wavelengths, it is decomposed into m channels of decomposed signal light λmn. In this example, the demultiplexer 5 is an arrayed waveguide grating. When there are m channels of signal light of different wavelengths, the signal output The light passes through the demultiplexer 2, and the signal light of different wavelengths has a phase difference due to the difference in the travel distance, so that the signal output light with different wavelengths is deconstructed into m-channel decomposition signal light, for example, the first signal output The light consists of m channels of signal light λ ₁₁ , λ ₂₁ , ..., λ _(m-1)1 , λ _m1 generated by different optical signal generators 2, and when the de-optical multiplexer 5 receives the first signal When outputting light, the signal lights λ ₁₁ , λ ₂₁ , ..., λ _(m-1)1 , λ _{m1 of} different wavelengths pass through the demultiplexer 5 and produce a phase difference between each other. Therefore, the first signal The output light is decomposed into m channels of decomposed signal lights λ _11' , λ _21' , ..., λ _m1' , and the m channels of signal decomposed light correspond to the signal lights λ ₁₁ , λ ₂₁ , generated by each optical signal generator 2 respectively. ……, λ _(m-1)1 , λ _m1 .

When transmitting signals in the above embodiment of the present invention, the first optical signal generator, the second optical signal generator,..., the m-1th optical signal generator, and the mth optical signal generator respectively generate the first basic light λ _{1. The} second basic light λ ₂ , ..., the m-1th basic light λ _m-1 , and the m-th basic light λ _m , these basic lights are then split by the light modulation unit 22 and adjusted into n channels for The signal lights of different signals are combined, and then a total of m×n signal lights generated by the m groups of optical signal generators 2 enter the demultiplexing unit 32 through one of the input terminals; the m×n signal lights are The demultiplexing unit 32 is firstly dispersed in equal phases, and the optical path difference is generated due to the difference in the path distance, and then separately converged at each output terminal 33, that is, n from the first optical signal generator Channel signal lights λ ₁₁ , λ ₁₂ , ..., λ _1(n-1) , λ _1n are respectively converged at each output end 33 through the splitting multiplexer unit, and n channels of signal light from the m-th optical signal generator λ _m1 , λ _m2 , ..., λ _{m (n-1)} , λ _mn , similarly, through the demultiplexer 32 unit, respectively converge at each output terminal 33, therefore, each output terminal 33 converges from m channels respectively come from one of the signal lights generated by different optical signal generators 2 and synthesize one signal output light; after that, they are transmitted through the single-mode optical fiber 4 and restored by one of the optical multiplexers 5, and Deconstruction obtains one of the signal lights corresponding to each optical signal generator 2 respectively.

Thus, the present invention provides a new type of optical communication system, through the division of the multiplexer 3 distribution so that each of the de-multiplexer 5 can receive from a single single-mode optical fiber 4 with m channels respectively from different The signal output light composed of the signal light generated by the optical signal generator 2 is further restored to obtain m channels of decomposed signal light, and the signal to be transmitted is obtained therefrom.

In addition, it should be particularly noted that in the above embodiment, the optical signal generator 2 can be a laser array composed of n laser diodes emitting the same wavelength, and the laser diodes emit the same wavelength. In addition, the process of light splitting and signal modulation is subtracted, thereby simplifying the number of components used and reducing the occurrence of light loss.

In the following, a system consisting of four groups of optical signal generators 2, a demultiplexer 3, four single-mode fibers 4, and four de-multiplexers 5 is used for verification.

Referring to Figures 3 and 4, the light generating elements 21 of the four groups of optical signal generators 2 individually generate basic lights I, II, III, and IV with wavelengths of 1270nm, 1290nm, 1310nm, and 1330nm, and then pass through the light modulation unit 22 is divided into four signal lights, that is, a total of sixteen signal lights.

The demultiplexer 3 includes sixteen input terminals 31 and four output terminals 33 respectively connected to the four single-mode optical fibers 4. The sixteen signal lights enter from the sixteen input ends 31 in sequence, generate optical path differences and are then converged, and then enter the four single-mode optical fibers 4 from the four output ends 33 to be transmitted. The sequence defines the light transmitted in the four single-mode optical fibers 4 as the first signal output light I, the second signal output light II, the third signal output light III, and the fourth signal output light IV.

The four de-optical multiplexers 5 are respectively optically connected to four single-mode optical fibers 4, and are named as the first de-optical multiplexer, the second de-optical multiplexer, the third de-optical multiplexer, and the fourth in sequence. De-light multiplexer; the first signal output light I, the second signal output light II, the third signal output light III, and the fourth signal output light IV correspondingly enter the first de-light multiplexer and the second de-light multiplexer After being restored, the third demultiplexer, the third demultiplexer, and the fourth demultiplexer are restored to four decomposed signal lights.

Referring to FIG. 4, the four split signal lights correspond to the first signal output light I, the second signal output light II, the third signal output light III, and the fourth signal output light IV in sequence, and correspond to the first signal output light The decomposition signal light of I has four wavelengths, namely 1270nm, 1290nm, 1310nm, and 1330nm. Similarly, corresponding to the second signal output light II, the third signal output light III, and the fourth signal output light IV The decomposed signal lights each have 1270nm, 1290nm, 1310nm, and 1330nm light, which proves that the sixteen lights of the four groups of optical signal generators 2 are individually converged and output from the four output terminals 33 after passing through the demultiplexer 3 Then, each demultiplexer 5 is reduced to obtain light with wavelengths of 1270 nm, 1290 nm, 1310 nm, and 1330 nm from the four groups of optical signal generators 2 respectively.

In summary, the composite multi-fiber multi-wavelength large-capacity optical transmission module of the present invention generates m sets of basic light from m groups of optical signal generators 2, and then divides them into m×n signal lights through the optical modulation unit 22, and then By the demultiplexer 3, m×n channels of signal light are distributed and combined into n channels of signal output light, and each of the signal output lights is composed of m channels of signal light generated from different optical signal generators 2, and finally passed The demultiplexer 5 separates the original optical signal; the present invention enables several receiving ends to receive signal lights of different wavelengths and from different transmitting ends. Compared with the conventional technology, the same number of optical communication sub-divisions need to be installed. The wave multiplexer system can achieve the same effect as this embodiment. The present invention uses a more simplified configuration to increase the optical transmission capacity in the same space, so it can indeed achieve the objective of the invention.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to Within the scope of the patent for the present invention.

2: Optical signal generator

21: light generating element

22: light modulation unit

221: Spectroscopic element

222: Light Modulation Element

3: Demultiplexer

31: Input

32: Demultiplexer unit

22: output

4: Single mode fiber

5: De-light multiplexer

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Fig. 1 is a schematic diagram illustrating a conventional demultiplexer system for optical communication that transmits multiple signals; Figure 2 is a schematic diagram illustrating an embodiment of the composite multi-fiber multi-wavelength large-capacity optical transmission module of the present invention; Fig. 3 is a schematic diagram illustrating the wavelengths of the sixteen signal lights that four groups of optical signal generators generate four basic lights and then modulate them into the sixteen signal lights in the experiment of this embodiment; and FIG. 4 is a spectrum diagram illustrating the wavelengths contained in the light obtained by the deconstruction and reduction of the four demultiplexers individually in the experiment of this embodiment.

2: Optical signal generator

21: light generating element

22: light modulation unit

221: Spectroscopic element

222: Light Modulation Element

3: Demultiplexer

31: Input

32: Demultiplexer unit

22: output

4: Single mode fiber

5: De-light multiplexer

Claims (5)

A composite multi-fiber and multi-wavelength large-capacity optical transmission module includes: m groups of optical signal generators, each group of optical signal generators individually includes a light generating element for generating a basic light with a predetermined wavelength, and a The light modulation unit optically connected to the light generating element, the light modulation unit divides the basic light into n channels of signal light and outputs it outwards, where m and n are integers not less than 2; a demultiplexer is connected to the The m groups of optical signal generators are optically connected and include m×n input terminals, n output terminals, and a demultiplexing unit optically connecting the input terminals and output terminals. The m×n input terminals correspond to each The n-channel signal light from the group of optical signal generators enters. The demultiplexing unit adjusts one of the signal lights of each optical modulation unit into a signal output light containing signal lights of m wavelengths and then flows from one of the output ends to External output; n single-mode fibers, one end of each single-mode fiber is optically connected to one of the n output ends; and n de-optical multiplexers, each of which is optically connected to the n single-mode fibers The other end of one of them is used to receive the signal output light transmitted by the optically connected single-mode fiber, and then decompose the signal output light into m channels of signal light corresponding to the m types of basic light. The composite multi-fiber multi-wavelength large-capacity optical transmission module according to claim 1, wherein the light modulation unit has a light splitting element optically connected to the light generating element, and a light modulation element optically connected to the light splitting element, The light splitting element is used to divide the basic light into n channels of signal light, and the light modulation element modulates the split signal light. The composite multi-fiber multi-wavelength large-capacity optical transmission module according to claim 1, wherein the sub-wavelength multiplexing unit uses a slab waveguide to make the m×n signal light enter a predetermined optical path difference, so that the m After the wavefront of the ×n signal light is changed due to the change of the optical path, the m×n signal light is then converged into n channels of signal light containing m wavelengths of signal light separately into the n outputs by the slab waveguide. end. The composite multi-fiber multi-wavelength large-capacity optical transmission module according to claim 3, wherein the predetermined optical path difference generated by the m×n signal light satisfies

, △ f _FSR is the free spectral range of signal light, c is the speed of light, △ p is the optical path difference. The composite multi-fiber multi-wavelength large-capacity optical transmission module described in claim 4, wherein the m×n channels of signals converge into n channels of signal output light to meet △ f _FSR when entering the n output terminals individually

N _vh × △ f _ch , △ f _FSR is the free spectral range of the signal light, N _ch is the number of output terminals, and △ f _ch is the distance between the output terminals.

Images